R&AC Lecture 18 - Lesson 18 Refrigeration System...

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Lesson 18 Refrigeration System Components: Compressors Version 1 ME, IIT Kharagpur 1
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The objectives of this lesson are to: 1. Discuss basic components of a vapour compression refrigeration system ( Section 18.1 ) 2. Present classification of refrigerant compressors based on working principle and based on the arrangement of compressor motor or external drive (Section 18.2.1) 3. Describe the working principle of reciprocating compressors (Section 18.3) 4. Discuss the performance aspects of ideal reciprocating compressors with and without clearance ( Section 18.3.1 ) At the end of the lesson, the student should be able to: 1. List important components of a vapour compression refrigeration system 2. Classify refrigerant compressors based on their working principle and based on the arrangement of compressor motor/external drive 3. Enumerate salient features of positive displacement type compressors, dynamic compressors, open and hermetic compressors 4. Draw the schematic of a reciprocating compressor and explain its working principle 5. Define an ideal reciprocating compressor without clearance using pressure-volume and pressure-crank angle diagrams 6. Calculate the required displacement rate and power input of an ideal compressor without clearance 7. Define an ideal reciprocating compressor with clearance using pressure- volume and pressure-crank angle diagrams 8. Calculate the volumetric efficiency and power input of an ideal compressor with clearance, and 9. Discuss the effects of compression ratio and index of compression on the volumetric efficiency of a reciprocating compressor with clearance 18.1. Introduction A typical refrigeration system consists of several basic components such as compressors, condensers, expansion devices, evaporators, in addition to several accessories such as controls, filters, driers, oil separators etc. For efficient operation of the refrigeration system, it is essential that there be a proper matching between various components. Before analyzing the balanced performance of the complete system, it is essential to study the design and performance characteristics of individual components. Except in special applications, the refrigeration system components are standard components manufactured by industries specializing in individual components. Generally for large systems, depending upon the design specifications, components are selected from the manufacturers’ catalogs and are assembled at site. Even though most of the components are standard off-the-shelf items, sometimes components such as evaporator may be made to order. Small capacity refrigeration systems such as refrigerators, room and package air conditioners, Version 1 ME, IIT Kharagpur 2
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water coolers are available as complete systems. In this case the manufacturer himself designs or selects the system components, assembles them at the factory, tests them for performance and then sells the complete system as a unit.
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This note was uploaded on 02/29/2012 for the course CHEMICAL 302 taught by Professor Nptel during the Spring '12 term at Birla Institute of Technology & Science.

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R&AC Lecture 18 - Lesson 18 Refrigeration System...

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